. >> i think that we took it for granted that we live in the united states and we're safe here. >> we were caught off guard, we thought that we were invincible. and it really brought us together and brought us back down to earth. >> this memorial, all 35 t of it, will not be in the parking lot much longer, the skeleton will be installed this coming spring. >> and for more on the ceremonies, marking the anniversary, and to see a photo gallery of 9/11, 11 years later, go to cbs sf .com. >> of the main thing that think is misunderstood right now is how fundamentally good is on a lot of different levels. >> the facebook ipo flopped but mark zuckerberg says to look on the bright side. what he admits that he does not do anymore. >> we ran back upstairs with fire extinguishers to break the windows out. >> then he realized that some were trapped inside, drastic actions to escape this burning bay area apartment building?,,,, >> >> mark zuckerberg made his first public comments since facebook made its initial public offering, he had to face tough questions about the facebook stock slide. len ra